hey pdaddy, by no means am i a huge buff professional bodybuilder...but i HAVE read about a few natural herbs that INCREASE metabolism...and black pepper was definitely on the list...these are many substances that can increase your metabolism: Bhibitak, Guggulu, Sage, Pippali, Elecampane, Uva Ursi, Gokshura, Alfalfa, Ajwan, Cinnamon, Damiana, Dandelion, Parsley, Nettle, Shilajit,
Black Pepper, Ginger, Turmeric, Triphala, Clove, Cardamom
so according to what i know and some articles i've read black pepper helps your metabolism...but it works best when you combine it with some of the above herbs such as ginger (which is a fan favorite to combine with

)
hope this helps